线性功放中数字预失真方法的实验研究

    Experimental Investigation on Digital Predistortion Technology for Linear Power Amplifier

    • 摘要: 对数字预失真线性功放中两种主要的数字预失真方法:多项式拟合法和查找表构建预失真器法进行研究;首先针对两种方法所对应的不同预失真器结构,就预失真精度、算法复杂性、所需存储空间和自适应能力等进行分析对比;然后采用cdma2000调制信号源对两种方法预失真效果作ADS仿真分析和实验测试,验证了两种方法的可行性,并对两种方法预失真能力作进一步讨论;最后总结了两种预失真方法在功放线性化应用的优缺点和适用范围。

       

      Abstract: Two kinds of typical DPD (Digital Pre-Distortion) methods are presented in the paper, which are Polynomial Estimation and LUT( look up table). The merit and shortcoming of the two DPD methods are summarized with detailed analysis of the structures of predistorter, emphasizing on precision of DPD, complexity of arithmetic, memory space and self- adaptive capacity. Signal source cdma2000 is applied for ADS simulation and experiment measurement of the two DPD methods, whose predistortion ability are analyzed deeply. The characteristics and applicability of the two methods are summarized in the end of the paper.

       

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